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MySQL 1222: Too many partitions.
When encountering the error "1222: Too many partitions" in MySQL, you can immediately take the following actions:
- Check the Number of Partitions:
- Run the query to see how many partitions the affected table has:SELECT TABLENAME, PARTITIONNAME FROM INFORMATIONSCHEMA.PARTITIONS WHERE TABLESCHEMA = 'yourdatabasename';
- Merge or Drop Unnecessary Partitions (if possible and safe):
- If there are partitions that are no longer needed or can be merged without impacting your application, consider merging or dropping them.
- To drop a partition:ALTER TABLE yourtablename DROP PARTITION partitiontodrop;
- To merge partitions (assuming you're using range partitions):ALTER TABLE yourtablename REORGANIZE PARTITION partitiontomerge1, partitiontomerge2 INTO (PARTITION newpartitionname VALUES LESS THAN (new_value));
- Increase the `max_partitions` System Variable (if using MariaDB):
- This step applies if you are using MariaDB, which allows increasing the maximum number of partitions through the `max_partitions` system variable.
- Check the current value:SHOW VARIABLES LIKE 'max_partitions';
- Increase the value (requires SUPER privilege):SET GLOBAL maxpartitions = newvalue;
Replace `new_value` with the number of partitions you need. Note that this change is global and affects the whole database server.
Always ensure you have a backup before making structural changes to your database.
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